[Code of Federal Regulations]
[Title 49, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR179.100-14]

[Page 1027]
 
                        TITLE 49--TRANSPORTATION
 
 CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF 
                             TRANSPORTATION
 
PART 179_SPECIFICATIONS FOR TANK CARS--Table of Contents
 
 Subpart C_Specifications for Pressure Tank Car Tanks (Classes DOT-105, 
                         109, 112, 114 and 120)
 
Sec. 179.100-14  Bottom outlets.

    (a) Bottom outlets for discharge of lading is prohibited, except as 
provided in Sec. 179.103-3. If indicated in Sec. 179.101, tank may be 
equipped with a bottom washout of approved construction. If applied, 
bottom washout shall be in accordance with the following requirements;
    (1) The extreme projection of the bottom washout equipment may not 
be more than that allowed by appendix E of the AAR Specifications for 
Tank Cars (IBR, see Sec. 171.7 of this subchapter).
    (2) Bottom washout shall be of cast, forged or fabricated metal and 
shall be fusion-welded to the tank. It shall be of good weldable quality 
in conjunction with metal of tank.
    (3) If the bottom washout nozzle extends 6 inches or more from shell 
of tank, a V-shaped breakage groove shall be cut (not cast) in the upper 
part of the outlet nozzle at a point immediately below the lowest part 
of the inside closure seat or plug. In no case may the nozzle wall 
thickness at the root of the ``V'' be more than \1/4\-inch. Where the 
nozzle is not a single piece, provision shall be made for the equivalent 
of the breakage groove. The nozzle must be of a thickness to insure that 
accidental breakage will occur at or below the ``V'' groove or its 
equivalent. On cars without continuous center sills, the breakage groove 
or its equivalent may not be more than 15 inches below the tank shell. 
On cars with continuous center sills, the breakage groove or its 
equivalent must be above the bottom of the center sill construction.
    (4) The closure plug and seat shall be readily accessible or 
removable for repairs.
    (5) The closure of the washout nozzle must be equipped with a \3/4\-
inch solid screw plug. Plug must be attached by at least a \1/4\-inch 
chain.
    (6) Joints between closures and their seats may be gasketed with 
suitable material.
    (b) [Reserved]

[29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, 
and amended by Amdt. 179-10, 36 FR 21345, Nov. 6, 1971; Amdt. 179-40, 52 
FR 13046, Apr. 20, 1987; 66 FR 45186, Aug. 28, 2001; 68 FR 75760, Dec. 
31, 2003]